Answer:
v= 4.17 km/ s
Step-by-step explanation:
we apply the uniform motion formula:
v= d/t Formula (1)
Where
v : is the velocity in m/s
d: is the distance in meters (m)
t: is the time in seconds (s)
Equivalence
1 hour = 3600 s
Known data
d=15 km
t = 1 hour = 3600 s
Problem development
We apply the formula (1) for calculate the speed:
v= 15 km/3600 s
v= 4.17 km/ s